Pulldown for potteries



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PULLDOWN FOR POTTERIES.

APPLICATION FILED IAN-1,19I9.

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Patented Dec. 30; 1919.

UNITED STATES PATENT OFFICE.

GEORGE LOWRY, OF ROSEVILLE, OHIO, ASSIGNOB 0F ONE-HALF TO J. F. TANNER, 0F

ROSEVILLE, OHIO.

PULLDOWN FOR POTTERIES.

Specification of Letters Patent.

Patented Dec. 30, 1919.

Application filed January 7, 1919. Serial No. 270,034.

To all whom it may concern:

Be it known that I, GEORGE Lownr, a citizen of the United States of America, residing at Roseville, in the county of Muskingum and State of Ohio, have invented new and useful Improvements in Pulldowns for Potteries, of which the following is a specification.

The purpose of the invention is to provide a new and improved form of pull-down for potteries whereby the shoe may be easily and quickly removed from the mold without the use of the slide such as is commonly employed. Further than efiectively removing the shoe from the mold, the pull-down is designed so that it may be easily. raised when removing the shoe and it is further so constructed that when the shoe is raised clear of the mold the shoe may be swung to one side.

Other and further purposes and features of the invention appear in the description which follows.

To the exact construction in which it is shown and described, the invention is not to be restricted. The right is reserved to make such changes or alterations as the actual reduction to practice may suggest, in so far as such changes or alterations are compatible in spirit with the annexed claims.

The same numerals of reference designate the same parts throughout the several figures of the drawings, wherein:

Figure 1 is a view in side elevation of the improved pull-down.

Fig. 2 is a view similar to Fig. 1 but looking at the opposite side of the device.

Fig. 3 is a section on the line 33 of Fig. 1.

Fig. 4; is a section on the line H of Fig.

Fig. 5 is a perspective view of a guide forming part of the improved device.

Fig. 6 is a perspective detail view of the rear end of the operating lever which is engageable in the guide.

In the drawings there is illustrated a bench 1 in whose structure there is included a potters wheel 2. At the back of the bench, there is an upstanding plate 3 having a right angular extension 4 at its upper end, this right angular extension overhangs the bench 1. On top of the bench there is positioned a bearing 5 in which there is journaled the lower end of an upright shaft 6,

the latter having at its upper end a centrally disposed upwardly projecting stud 7 which pivotally engages a hole formed in the right angular extension 4 in alinement with the bearingfi, the stud 7 being, of course, axially alined with the shaft 6. It is obvious that this construction provides for pivotal movement of the shaft 6.

On the shaft 6 there are carried two laterally projecting arms 8 formed with hubs 9 which are secured to the shaft. These two arms are mounted so as to be in alinement with each other and each is bifurcated at its outer or free end, the legs 10 left by bifurcating the ends acting as guides for the shoe arm 11 which is carried between them. Fixed in the two legs 10 of each arm there are the studs 12. These studs cross transversely the space between the two legs and are positioned one to the forward of the front edge of the arm and the other to the rear of the rear edge thereof. Each of these studs carries a roller 13 against which the edges of the arm may bear to facilitate the raising of the arm, acting as anti-friction means for the arm.

The shaft 6, arms 8 and their attendant parts are made preferably of metal but the shoe arm 11 is made preferably of wood and carries a transversely disposed pin let bearing on top of the legs 10 of the uppermost arm 8 to limit the downward movement of the said shoe arm. In order that the shoe arm may be raised and lowered, there is provided a hand lever 15, also made preferably of wood, and a wooden connecting rod 16 pivotally connects at one end with the lever 15 and at the other end with the upper end of the arm 11. This lever 15 at the end remote from the handle 17 is secured to the arm 18 formed with the preferably metal disk 19 from which the arm 18 tangentially projects. This disk 19 is pivotally mounted at its center on a stud 20 which is set in a disk 21 formed with a sleeve 22 which is secured to the shaft 6 below the lower arm 8. This construction provides for the raising and lowering of the lever 15 and with it the arm 11, the large bearing surface between the disks .20 and 21 serving to preclude all lateral movement of the lever 15 as the latter is raised and lowered.

The disk 19 is formed with the arm 23 projecting substantially in a radial direction therefrom and the free end of this arm slidingly engages in an arcuate guide 2% mounted on the bench 1, this arcuate guide being formed with a lateral recess :25 of sufficient width to permit the arm 23 being dis engaged from the guide when the arm is lowered and the lever 15 raised. It will be observed that the guide 2a is so formed that the arm 23 may not be lowered farther than the point where it is permitted to be moved laterally to pass through the recess 25. As long as the arm 23 is engaged by the guide 524, all parts of the device are locked against movement except the raising andl lowering movement that may be imparted to the shoe arm 11 by raising and lowering the lever 15. When the lever 15 is raised to its highest point, however, the arm :23 is in a position where it may be passed through the recess 25. Thus if the lever 15 i raised to the said highest point, a lateral pressure applied to the lever on one side may move the whole device to one side of its normal position, the shaft 6 acting as a pivot for such movement.

The shoe arm 11 is formed to present an irregular contour in elevation and as the edges of this irregular contour engage the roller 13 of the lower arm 8 when the arm 11 is raised and lowered, the said arm 11 is rocked back and forth.

At the lower end of the arm there is detachably mounted the shoe 26. The sha e of this shoe is, of course, dictated by t e shape of the piece which is to be molded.

In the use of the device, the ring 27 is mounted on the wheel 2 in the usual way and the plastic material of which the mold is to be formed is deposited therein, the arms 8 and their attendant parts having been moved to one side, as before described. hen the wheel is put in motion, the arms 8 are rocked back to their normal position and the lever 15 and all the parts directly connected therewith are raised so that the arm 23 may be lowered to permit its free end to pass through the slot to be engaged in the guide as. The lever 15 is then lowered and this lowering causes the shoe 26 to penetrate the material of which the mold is being made, the irregular portion of the arm 11 moving the shoe backward to its normal position as it reaches its lowermost position. The rotation of the wheel 2 then permits the shoe to shape the mold out of the plastic ma terial in the ring 27 and when this is finally completed, the raising of the lever 15 raises the shoe from the mold, the irregular portion of the arm 11 moving the shoe forwardly as it is raised upwardly, so that the shoe is thus easily disengaged from the mold. As the shoe reaches its highest position, where it is free of the mold, the arm 23 is in a position to pass through the recess 25 and the whole may then be shifted to one side to permit the mold to be removed from the ring. The object of providing the side shifting feature in the device is to enable short persons to work effectively therewith. Otherwise it would be necessary to raise the shoe much higher than is the case with the present construction in order to make room for the removal of the mold from the ring.

The invention having been described, what is claimed as new and useful is:

1. In a device of the class described, the combination with a bench and a potters wheel carried thereby, of a vertical shaft pivotally mounted on said bench, laterally projecting arms mounted on the said shaft, a shoe arm, the said laterally projecting arms having their free ends bifurcated and carrying anti-friction rollers in said bifurcations, the shoe arm being guided by said bifurcated ends and having its edges engage the said rollers, the lower portion of the shoe arm being of irregular coi'iformation where it engages the rollers of one o'isaid late ally projecting arms, a pivotally mounted lever carried by said upright shaft, connections between said lever and said shoe arm, a shoe carried at the lower end of said arm, and means whereby the said shaft is secured against angular movement except when said lever is raised to elevate the shoe arm and simultaneously move the shoe from contact with a mold.

2. In a. device of the class described, the combination with a bench and a potters wheel carried thereby, of a vertical shaft pivotally mounted on said bench, laterally projecting arms mounted on the said shaft, a shoe arm, the said laterally projecting arms having their free ends bifurcated and carrying anti-friction rollers in said bifurcations, the shoe arm being guided by said bifurcated ends and having its edges engage tlie said rollers, the lower portion of the shoe arm being of irregular conformation where it engages the rollers of one of said laterally projecting arms, a pivotally mount. ed lever carried by said upright shaft, connections between said lever and said shoe arm, a shoe carried at the lower end of said arm, and a guide mounted on the bench, the lever being formed with an arm slidingly engaging said guide and the guide having a lateral recess through which the arm may pass when the said lever is raised to elevate the shoe arm and move the shoe out of contact with a mold. V

In testimony whereof I atlix my signature.

GEORGE LOWRY. 

